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Damien George 3c4bfd1dec py/objexcept: Support errno attribute on OSError exceptions. 
This commit adds the errno attribute to exceptions, so code can retrieve
errno codes from an OSError using exc.errno.

The implementation here simply lets `errno` (and the existing `value`)
attributes work on any exception instance (they both alias args[0]).  This
is for efficiency and to keep code size down.  The pros and cons of this
are:

Pros:
- more compatible with CPython, less difference to document and learn
- OSError().errno will correctly return None, whereas the current way of
  doing it via OSError().args[0] will raise an IndexError
- it reduces code size on most bare-metal ports (because they already have
  the errno qstr)
- for Python code that uses exc.errno the generated bytecode is 2 bytes
  smaller and more efficient to execute (compared with exc.args[0]); so
  bytecode loaded to RAM saves 2 bytes RAM for each use of this attribute,
  and bytecode that is frozen saves 2 bytes flash/ROM for each use
- it's easier/shorter to type, and saves 2 bytes of space in .py files that
  use it (for each use)

Cons:
- increases code size by 4-8 bytes on minimal ports that don't already have
  the `errno` qstr
- all exceptions now have .errno and .value attributes (a cpydiff test is
  added to address this)

See also #2407.

Signed-off-by: Damien George <damien@micropython.org>
 		2021-04-23 22:03:46 +10:00
..
argcheck.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
asmarm.c py/asm: Add funcs/macros to emit machine code for logical-shift-right. 2020-06-27 00:24:04 +10:00
asmarm.h py/asm: Add funcs/macros to emit machine code for logical-shift-right. 2020-06-27 00:24:04 +10:00
asmbase.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
asmbase.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
asmthumb.c py/emitnative: Support binary ops on ARMv6M without use of ite instr. 2021-01-29 23:57:10 +11:00
asmthumb.h py/emitnative: Support binary ops on ARMv6M without use of ite instr. 2021-01-29 23:57:10 +11:00
asmx64.c py/asm: Add funcs/macros to emit machine code for logical-shift-right. 2020-06-27 00:24:04 +10:00
asmx64.h py/asm: Add condition codes for signed comparisons. 2020-06-27 00:24:04 +10:00
asmx86.c py/asm: Add funcs/macros to emit machine code for logical-shift-right. 2020-06-27 00:24:04 +10:00
asmx86.h py/asm: Add condition codes for signed comparisons. 2020-06-27 00:24:04 +10:00
asmxtensa.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
asmxtensa.h py/asm: Add funcs/macros to emit machine code for logical-shift-right. 2020-06-27 00:24:04 +10:00
bc.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
bc.h py/showbc: Pass in an mp_print_t struct to all bytecode-print functions. 2020-09-11 17:22:28 +10:00
bc0.h py/bc0.h: Shift comment to start of line to improve format consistency. 2020-02-28 10:29:32 +11:00
binary.c all: Rename BYTES_PER_WORD to MP_BYTES_PER_OBJ_WORD. 2021-02-04 22:46:42 +11:00
binary.h py/binary: Change mp_uint_t to size_t for index, size, align args. 2019-09-02 13:14:27 +10:00
builtin.h extmod/uasyncio: Add optional implementation of core uasyncio in C. 2020-03-26 01:25:45 +11:00
builtinevex.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
builtinhelp.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
builtinimport.c all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
compile.c py/compile: Don't await __aiter__ special method in async-for. 2020-07-25 00:58:18 +10:00
compile.h py: Add global default_emit_opt variable to make emit kind persistent. 2019-08-28 12:47:58 +10:00
dynruntime.h py/dynruntime.h: Add mp_import_* and mp_load/store_*. 2020-09-18 18:34:02 +10:00
dynruntime.mk py/dynruntime.mk: Set MICROPY_ENABLE_DYNRUNTIME instead of per module. 2020-04-05 14:13:02 +10:00
emit.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
emitbc.c all: Rename BYTES_PER_WORD to MP_BYTES_PER_OBJ_WORD. 2021-02-04 22:46:42 +11:00
emitcommon.c py/scope: Optimise scope_find_or_add_id to not need "added" arg. 2018-10-28 00:38:18 +11:00
emitglue.c py/showbc: Pass in an mp_print_t struct to all bytecode-print functions. 2020-09-11 17:22:28 +10:00
emitglue.h py: Integrate sys.settrace feature into the VM and runtime. 2019-08-30 16:44:12 +10:00
emitinlinethumb.c py/emitinlinethumb: Exclude code using #if when ARMV7M disabled. 2021-01-29 23:57:10 +11:00
emitinlinextensa.c py: Use unsigned comparison of chars. 2020-10-22 11:47:36 +02:00
emitnarm.c py/emitnative: Add support for return/break/continue in try and with. 2018-09-04 14:31:28 +10:00
emitnative.c py/emitnative: Support binary ops on ARMv6M without use of ite instr. 2021-01-29 23:57:10 +11:00
emitnthumb.c py/emitnative: Add support for return/break/continue in try and with. 2018-09-04 14:31:28 +10:00
emitnx64.c py/emitnative: Add support for return/break/continue in try and with. 2018-09-04 14:31:28 +10:00
emitnx86.c py/nativeglue: Add new header file with native function table typedef. 2019-12-12 20:15:28 +11:00
emitnxtensa.c py/emitnative: Add support for return/break/continue in try and with. 2018-09-04 14:31:28 +10:00
emitnxtensawin.c py: Add new Xtensa-Windowed arch for native emitter. 2019-10-05 13:44:53 +10:00
formatfloat.c all: Fix implicit conversion from double to float. 2020-04-18 22:42:24 +10:00
formatfloat.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
frozenmod.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
frozenmod.h various: Update early copyright years to match actual edit history. 2019-05-17 18:06:11 +10:00
gc.c all: Rename BYTES_PER_WORD to MP_BYTES_PER_OBJ_WORD. 2021-02-04 22:46:42 +11:00
gc.h py/gc: Change include of stdint.h to stddef.h. 2021-02-05 15:46:56 +11:00
grammar.h py/compile: Implement PEP 526, syntax for variable annotations. 2020-06-16 23:18:01 +10:00
lexer.c py, extmod: Introduce and use MP_FALLTHROUGH macro. 2020-10-22 11:53:16 +02:00
lexer.h py/compile: Implement PEP 572, assignment expressions with := operator. 2020-06-16 22:02:24 +10:00
makecompresseddata.py py/makecompresseddata.py: Make compression deterministic. 2020-04-20 10:32:49 +10:00
makemoduledefs.py all: Update Python code to conform to latest black formatting. 2020-08-29 15:18:01 +10:00
makeqstrdata.py all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
makeqstrdefs.py tools/makeqstrdefs.py: Run qstr preprocessing in parallel. 2020-11-12 15:04:53 +11:00
makeversionhdr.py py/makeversionhdr: Honor SOURCE_DATE_EPOCH if present. 2021-01-31 17:48:59 +01:00
malloc.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
map.c py/objdict: Add mp_const_empty_dict_obj, use it for mp_const_empty_map. 2020-10-10 00:16:26 +11:00
misc.h extmod/modbluetooth: Add API for L2CAP channels. 2020-11-24 01:07:17 +11:00
mkenv.mk py/mkenv.mk: Move usage of 32-bit flags to py.mk. 2020-01-12 10:34:10 +11:00
mkrules.cmake rp2: Add support for USER_C_MODULES to CMake build system. 2021-03-31 00:26:01 +11:00
mkrules.mk py/mkrules.mk: Remove stray vpath and unused -Itmp, add $(Q) for $(AR). 2020-12-14 13:57:15 +11:00
modarray.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
modbuiltins.c py/modbuiltins: Fix getattr to work with class raising AttributeError. 2020-06-02 15:42:20 +10:00
modcmath.c all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
modcollections.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
modgc.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
modio.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
modmath.c py/modmath: Simplify handling of positional args to reduce code size. 2020-12-14 13:30:56 +11:00
modmicropython.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
modstruct.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
modsys.c py/modsys: Use consistent naming pattern for module-level const objects. 2020-05-28 10:02:14 +10:00
modthread.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
moduerrno.c all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
mpconfig.h all: Bump version to 1.15. 2021-04-19 00:11:51 +10:00
mperrno.h py/mperrno: Define MP_EWOULDBLOCK as EWOULDBLOCK, not EAGAIN. 2018-05-01 15:53:25 +10:00
mphal.h all: Rename absolute time-based functions to include "epoch". 2020-09-18 17:20:34 +10:00
mpprint.c py/mpprint: Fix length calculation for strings with precision-modifier. 2020-12-07 23:32:06 +11:00
mpprint.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
mpstate.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
mpstate.h py/persistentcode: Maintain root ptr list of imported native .mpy code. 2020-08-02 22:34:09 +10:00
mpthread.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
mpz.c py/mpz: Fix overflow of borrow in mpn_div. 2021-02-08 11:50:05 +11:00
mpz.h tools/codeformat.py: Eliminate need for sizeof fixup. 2020-03-11 14:34:40 +11:00
nativeglue.c all: Fix implicit floating point promotion. 2020-04-18 22:36:14 +10:00
nativeglue.h py/nativeglue.h: Rename "setjmp" entry to "setjmp_" to avoid any clash. 2020-05-14 21:48:05 +10:00
nlr.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
nlr.h py/nlr: Implement NLR for AArch64. 2021-03-11 12:51:10 +11:00
nlraarch64.c py/nlr: Implement NLR for AArch64. 2021-03-11 12:51:10 +11:00
nlrpowerpc.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
nlrsetjmp.c py/nlr: Factor out common NLR code to macro and generic funcs in nlr.c. 2017-12-28 16:46:30 +11:00
nlrthumb.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
nlrx64.c py/nlrx64: Fix typo in comment. 2021-03-11 12:51:10 +11:00
nlrx86.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
nlrxtensa.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
obj.c py/objcomplex: Add mp_obj_get_complex_maybe for use in complex bin-op. 2020-06-27 01:03:10 +10:00
obj.h py/objdict: Add mp_const_empty_dict_obj, use it for mp_const_empty_map. 2020-10-10 00:16:26 +11:00
objarray.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
objarray.h py/objarray.h: Add mp_obj_memoryview_init() helper function. 2020-09-25 12:23:11 +10:00
objattrtuple.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objbool.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objboundmeth.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objcell.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objclosure.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
objcomplex.c py/objcomplex: Add mp_obj_get_complex_maybe for use in complex bin-op. 2020-06-27 01:03:10 +10:00
objdeque.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
objdict.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
objenumerate.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objexcept.c py/objexcept: Support errno attribute on OSError exceptions. 2021-04-23 22:03:46 +10:00
objexcept.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objfilter.c py: Downcase all MP_OBJ_IS_xxx macros to make a more consistent C API. 2019-02-12 14:54:51 +11:00
objfloat.c py: Rename BITS_PER_BYTE to MP_BITS_PER_BYTE. 2021-02-04 22:46:42 +11:00
objfun.c py/objfun: Support fun.__globals__ attribute. 2021-01-29 23:57:10 +11:00
objfun.h py: Integrate sys.settrace feature into the VM and runtime. 2019-08-30 16:44:12 +10:00
objgenerator.c py: Rework mp_convert_member_lookup to properly handle built-ins. 2020-06-30 23:55:32 +10:00
objgenerator.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
objgetitemiter.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
objint.c py: Rename BITS_PER_BYTE to MP_BITS_PER_BYTE. 2021-02-04 22:46:42 +11:00
objint.h py/modsys: Use consistent naming pattern for module-level const objects. 2020-05-28 10:02:14 +10:00
objint_longlong.c py/modsys: Use consistent naming pattern for module-level const objects. 2020-05-28 10:02:14 +10:00
objint_mpz.c py/mpz: Do sign extension in mpz_as_bytes for negative values. 2020-11-11 22:18:24 +11:00
objlist.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
objlist.h py/obj.h: Move declaration of mp_obj_list_init to objlist.h. 2018-03-13 14:03:15 +11:00
objmap.c py: Downcase all MP_OBJ_IS_xxx macros to make a more consistent C API. 2019-02-12 14:54:51 +11:00
objmodule.c all: Rename "sys" module to "usys". 2020-09-04 00:10:24 +10:00
objmodule.h py/objmodule.h: Remove obsolete mp_builtin_module_weak_links_map decl. 2020-02-11 15:43:13 +11:00
objnamedtuple.c all: Format code to add space after C++-style comment start. 2020-04-23 11:24:25 +10:00
objnamedtuple.h py/objnamedtuple: Allow to reuse namedtuple basic functionality. 2017-11-20 09:30:06 +02:00
objnone.c py/obj: Add MICROPY_OBJ_IMMEDIATE_OBJS option to reduce code size. 2020-01-13 01:01:45 +11:00
objobject.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
objpolyiter.c all: Remove inclusion of internal py header files. 2017-10-04 12:37:50 +11:00
objproperty.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objrange.c py: Rename remaining object types to be of the form mp_type_xxx. 2021-03-26 13:48:34 +11:00
objreversed.c py: Downcase all MP_OBJ_IS_xxx macros to make a more consistent C API. 2019-02-12 14:54:51 +11:00
objset.c py, extmod: Introduce and use MP_FALLTHROUGH macro. 2020-10-22 11:53:16 +02:00
objsingleton.c py/objsingleton: Use mp_generic_unary_op for singleton objects. 2019-12-27 12:53:36 +11:00
objslice.c all: Clean up error strings to use lowercase and change cannot to can't. 2020-04-13 22:19:37 +10:00
objstr.c py/mpprint: Fix length calculation for strings with precision-modifier. 2020-12-07 23:32:06 +11:00
objstr.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objstringio.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
objstringio.h py/objstringio: If created from immutable object, follow copy on write policy. 2017-06-09 17:33:01 +03:00
objstrunicode.c py/mpprint: Fix length calculation for strings with precision-modifier. 2020-12-07 23:32:06 +11:00
objtuple.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
objtuple.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
objtype.c py/objtype: Handle __dict__ attribute when type has no locals. 2020-10-10 00:16:32 +11:00
objtype.h py/runtime: Don't allocate iter buf for user-defined types. 2019-12-27 12:34:22 +11:00
objzip.c py: Downcase all MP_OBJ_IS_xxx macros to make a more consistent C API. 2019-02-12 14:54:51 +11:00
opmethods.c py: Make mp_obj_get_type() return a const ptr to mp_obj_type_t. 2020-01-09 11:25:26 +11:00
pairheap.c py/pairheap: Properly unlink node on pop and delete. 2020-03-26 01:21:04 +11:00
pairheap.h py/pairheap: Add helper function to initialise a new node. 2020-03-26 01:21:04 +11:00
parse.c py/parse: Expose rule-name printing as MICROPY_DEBUG_PARSE_RULE_NAME. 2020-10-01 15:26:43 +10:00
parse.h py/parse: Pass in an mp_print_t to mp_parse_node_print. 2020-09-11 23:00:03 +10:00
parsenum.c all: Fix implicit floating point promotion. 2020-04-18 22:36:14 +10:00
parsenum.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
parsenumbase.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
parsenumbase.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
persistentcode.c all: Rename BYTES_PER_WORD to MP_BYTES_PER_OBJ_WORD. 2021-02-04 22:46:42 +11:00
persistentcode.h py/persistentcode: Make ARM Thumb archs support multiple sub-archs. 2019-12-12 20:15:28 +11:00
profile.c py/profile: Resolve name collision with STATIC unset. 2021-04-12 22:31:42 +10:00
profile.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
py.cmake py/py.cmake: Introduce MICROPY_INC_CORE as a list with core includes. 2021-04-09 13:08:35 +10:00
py.mk py/nlr: Implement NLR for AArch64. 2021-03-11 12:51:10 +11:00
pystack.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
pystack.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
qstr.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
qstr.h py/qstr.h: Remove QSTR_FROM_STR_STATIC macro. 2021-01-30 13:40:48 +11:00
qstrdefs.h all: Add *FORMAT-OFF* in various places. 2020-02-28 10:31:07 +11:00
reader.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
reader.h py: Allow lexer to raise exceptions during construction. 2017-03-14 11:52:05 +11:00
repl.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
repl.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
ringbuf.c py/ringbuf: Add peek16 method. 2019-11-21 12:04:53 +11:00
ringbuf.h extmod/modbluetooth: Make modbluetooth event not a bitfield. 2020-06-05 14:04:20 +10:00
runtime.c py/runtime: Make sys.modules preallocate to a configurable size. 2021-04-12 22:36:16 +10:00
runtime.h py/scheduler: Convert mp_sched_full and mp_sched_num_pending to macros. 2020-05-08 23:20:45 +10:00
runtime0.h py/nativeglue: Add new header file with native function table typedef. 2019-12-12 20:15:28 +11:00
runtime_utils.c py: mp_call_function_*_protected(): Pass-thru return value if possible. 2017-12-05 00:38:41 +02:00
scheduler.c py/scheduler: Convert mp_sched_full and mp_sched_num_pending to macros. 2020-05-08 23:20:45 +10:00
scope.c py/scope: Name and use id_kind_type_t. 2020-10-22 11:40:56 +02:00
scope.h py/scope: Name and use id_kind_type_t. 2020-10-22 11:40:56 +02:00
sequence.c all: Use MP_ERROR_TEXT for all error messages. 2020-04-05 15:02:06 +10:00
showbc.c py/showbc: Pass in an mp_print_t struct to all bytecode-print functions. 2020-09-11 17:22:28 +10:00
smallint.c all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
smallint.h py: Rename WORD_MSBIT_HIGH to MP_OBJ_WORD_MSBIT_HIGH. 2021-02-04 22:46:42 +11:00
stackctrl.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
stackctrl.h all: Use the name MicroPython consistently in comments 2017-07-31 18:35:40 +10:00
stream.c py/stream: Remove mp_stream_errno and use system errno instead. 2020-04-27 23:58:46 +10:00
stream.h py/stream.h: Include sys/types.h to get size_t and off_t for POSIX API. 2020-03-25 01:00:52 +11:00
unicode.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
unicode.h py/objstr: Add check for valid UTF-8 when making a str from bytes. 2017-09-06 16:43:09 +10:00
usermod.cmake rp2: Add support for USER_C_MODULES to CMake build system. 2021-03-31 00:26:01 +11:00
vm.c py/vm: For tracing use mp_printf, and print state when thread enabled. 2021-03-17 12:13:53 +11:00
vmentrytable.h py/vmentrytable: Ignore GCC -Woverride-init. 2020-10-22 11:47:36 +02:00
vstr.c all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
warning.c py: Update my copyright info on some files. 2019-02-06 00:19:00 +11:00